Cosmogenic stable nuclide, ⁴⁵Sc, in Gibeon iron meteorite

Abstract

Cosmogenic stable nuclide, ⁴⁵Sc, concentrations in Gibeon iron meteorite were determined by radiochemical neutron activation analysis. ⁴⁵Sc concentration down to 0.0064 ppb was able to determined in this study. Blank value was estimated to be less than 0.001 ppb.⁴⁵Sc concentrations in Gibeon were found to be highly correlated with ⁴He concentrations. It was consistent with the correlation observed in iron meteorites other than Gibeon meteorite. In Gibeon meteorite two different irradiation ages were observed using rare gas isotopes. In this study 8 fragments with different irradiation ages were analyzed. Systematic difference among 8 fragments was not found for the correlation between ⁴⁵Sc and ⁴He. It was concluded that 2 different irradiation ages observed in Gibeon was not resulted from loss of rare gases from the body.